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1
JEE Main 2019 (Online) 9th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
A power transmission line feeds input power at 2300 V to a srep down transformer with its primary windings having 4000 turns. The output power is delivered at 230 V by the transformer. If the current in the primary of the transformer is 5A and its efficiency is 90%, the output current would be :
A
50 A
B
45 A
C
35 A
D
25 A
2
JEE Main 2019 (Online) 9th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
A series AC circuit containing an inductor (20 mH), a capacitor (120 $$\mu $$F) and a resistor (60 $$\Omega $$) is driven by an AC source of 24V/50 Hz. The energy dissipated in the circuit in 60 s is :
A
5.65 $$ \times $$ 102J
B
2.26 $$ \times $$ 103J
C
5.17 $$ \times $$ 102 J
D
3.39 $$ \times $$ 103 J
3
JEE Main 2018 (Online) 16th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
A power transmission line feeds input power at 2300 V to a step down transformer with its primary windings having 4000 turns, giving the output power at 230 V. If the current in the primary of the transformer is 5 A, and its efficiency is 90%, the output current would be ;
A
50 A
B
45 A
C
25 A
D
20 A
4
JEE Main 2018 (Online) 16th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
A plane electromagnetic wave of wavelength $$\lambda $$ has an intensity I. It is propagatting along the positive Y-direction. The allowed expressions for the electric and magnetic fields are givn by :
A
JEE Main 2018 (Online) 16th April Morning Slot Physics - Alternating Current and Electromagnetic Induction Question 181 English Option 1
B
JEE Main 2018 (Online) 16th April Morning Slot Physics - Alternating Current and Electromagnetic Induction Question 181 English Option 2
C
JEE Main 2018 (Online) 16th April Morning Slot Physics - Alternating Current and Electromagnetic Induction Question 181 English Option 3
D
JEE Main 2018 (Online) 16th April Morning Slot Physics - Alternating Current and Electromagnetic Induction Question 181 English Option 4
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